Abstract
AbstractThanks to injection rate shaping enabled by high pressure, fast actuating, high atomization injectors, diesel engines can deliver fuel energy conversion efficiencies chemical to mechanical above 52%, with power densities up to 130 kW/L while satisfying peak pressure and gradient of pressure build‐up constraints. Despite further research for improving diesel engines and diesel engine vehicles have practically stopped with diesel gate, there are significant margins of further improvements of what is still the best option for the economy and the environment of onboard energy storage. Mechanical energy can be stored onboard, at about ~18.8 to 19.1 MJ/L and ~5.2 to 5.3 kWh/L, or ~22.2 to 22.6 MJ/kg and ~6.1 to 6.3 kWh/kg. This is much more than Li‐ion batteries at less than 0.100 to 0.265 kWh/kg or 0.250 to 0.670 kWh/L.
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